Patent US3928024A successfully refreshed from Google Patents.
US3928024A
Expired / Lapsed
US
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Ore pretreatment process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-11-19
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Granted: 1975-12-23
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Expires: 1994-11-19
Abstract
Abstract A process is provided for lowering the sulfur and phosphorus content of a particulate oxidic iron ore which renders the ore more suitable for use in direct ore reduction processes. By pretreating the ore with an aqueous solution of an inorganic base, preferably at slightly elevated temperatures, the sulfur and phosphorus levels in the ore are lowered to a desirable range.
Inventors
- 👤 David E Mueller
- 👤 Marnell A Segura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:55
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A METHOD OF PREHEATING A GANGUE-CONTAINING PARTICULATE OXIDIC IRON ORE LOWER THE SULFUR AND PHOSPHORUS IN THE ORE WHICH COMPRISES WASHING A PARTICULATE OXIDIC IRON ORE CONSISTING ESSENTIALLY OF IRON OXIDES AND GANGUE WITH AN AQUEOUS SOLUTION OF AN INORGANIC BASE AND THEREAFTER WASHING THE ORE WITH WATER.
Claim 2
Independent Claim
48 words
A METHOD OF PREHEATING A GANGUE-CONTAINING PARTICULATE OXIDIC IRON ORE LOWER THE SULFUR AND PHOSPHORUS IN THE ORE WHICH COMPRISES WASHING A PARTICULATE OXIDIC IRON ORE CONSISTING ESSENTIALLY OF IRON OXIDES AND GANGUE WITH AN AQUEOUS SOLUTION OF AN INORGANIC BASE AND THEREAFTER WASHING THE ORE WITH WATER.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the inorganic base is selected from the group consisting of alkali metal hydroxides, carbonates, bicarbonates and mixtures thereof.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein the alkali metal is sodium.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said ore is washed with said solution at a temperature in the range of about 20*C. to about 100*C.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said inorganic base is sodium carbonate.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein at least 0.1 part by weight of base is used per part by weight of ore.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein about 1.0 part by weight of base per part by weight of ore is used.
Claim 9
Dependent Claim
62 words
A process for lowering sulfur and phosphorus in particulate oxidic iron ores comprising: mixing an inorganic base with an oxidic iron ore consisting essentially of iron oxides and gangue in the ratio of about 0.1 to about 1.5 parts of base by weight per part of iron ore; heating the mixture up to about 300*C.; and washing the heated mixture with water.
Claim 10
Dependent Claim
62 words
A process for lowering sulfur and phosphorus in particulate oxidic iron ores comprising: mixing an inorganic base with an oxidic iron ore consisting essentially of iron oxides and gangue in the ratio of about 0.1 to about 1.5 parts of base by weight per part of iron ore; heating the mixture up to about 300*C.; and washing the heated mixture with water.
Claim 11
Dependent Claim
23 words
The process of claim 8 wherein the base is selected from the group consisting of alkali metal hydroxides, carbonates, bicarbonates and mixtures thereof.
Claim 12
Dependent Claim
35 words
The process of claim 8 wherein the inorganic base is sodium carbonate; about 1.0 parts of base per part of ore is used; and the mixture is heated to about 300*C. for about 60 minutes.
References Cited (Backward Citations)
US3343909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |